/home/gencode/cen/s1668/en1668 1 5680 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |[.]
BRITISH STANDARD Welding consumables Ð Rods, wires and deposits for tungsten inert gas welding of non alloy and fine grain steels Ð Classification The European Standard EN 1668 : 1997 has the status of a British Standard ICS 25.160.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BS EN 1668 : 1997 BS EN 1668 : 1997 National foreword This British Standard is the English language version of EN 1668 : 1997 It partially supersedes BS 2901 : Part : 1983, which is withdrawn The UK participation in its preparation was entrusted to Technical Committee WEE/39, Welding consumables, which has the responsibility to: ± aid enquirers to understand the text; ± present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; ± monitor related international and European developments and promulgate them in the UK A list of organizations represented on this committee can be obtained on request to its secretary Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled `International Standards Correspondence Index', or by using the `Find' facility of the BSI Standards Electronic Catalogue Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages to 6, an inside back cover and a back cover This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 1997 ISBN 580 28921 Amendments issued since publication Amd No Date Text affected EN 1668 EUROPEAN STANDARD NORME EUROPÊENNE EUROPẰISCHE NORM August 1997 ICS 25.160.20 Descriptors: Welding, arc welding, filler wire, filler metal, steels, unalloyed steels, characteristics, chemical composition, mechanical properties, classifications English version Welding consumables Ð Rods, wires and deposits for tungsten inert gas welding of non alloy and fine grain steels Ð Classification Produits consommables pour le soudage Ð Baguettes, fils d'apport et deÂpoÃts pour le soudage sous atmospheÁre inerte avec eÂlectrode reÂfractaire des aciers non allieÂs et des aciers aÁ grains fins Ð Classification SchweibzusaÈtze Ð StaÈbe, DraÈhte und Schweibgut zum Wolfram-Schutzgasschweiben von unlegierten StaÈhlen und FeinkornstaÈhlen Ð Einteilung This European Standard was approved by CEN on 1997-07-24 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN Ð All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 1668 : 1997 E Page EN 1668 : 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 121, Welding, the secretariat of which is held by DS This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1998, and conflicting national standards shall be withdrawn at the latest by February 1998 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Contents Foreword Introduction Scope Normative references Classification Symbols and requirements 4.1 Symbol for the product/process 4.2 Symbol for strength and elongation of all-weld metal 4.3 Symbol for impact properties of all-weld metal 4.4 Symbol for the chemical composition of rods/wires Mechanical tests 5.1 General 5.2 Preheating and interpass temperature 5.3 Welding conditions Chemical analysis Technical delivery conditions Designation Annex A (informative) Bibliography Page 3 3 3 4 4 4 5 BSI 1997 Page EN 1668 : 1997 Introduction Classification This standard proposes a classification in order to designate rods and wires in terms of the yield strength, tensile strength and elongation of the all-weld metal The ratio of yield to tensile strength of weld metal is generally higher than that of parent metal Users should note that matching weld metal yield strength to parent metal yield strength will not necessarily ensure that the weld metal tensile strength matches that of the parent material Where the application requires matching tensile strength, therefore, selection of the consumable should be made by reference to column of table It should be noted that the mechanical properties of all-weld metal test specimens used to classify the rods and wires will vary from those obtained in production joints because of differences in welding procedure such as diameter, width of weave, welding position and material composition The classification includes all-weld metal properties obtained with a rod or wire and the shielding gas EN 439-I1 The classification is based on the rod/wire diameter 2,4 mm It shall be noted that only one shielding gas is used for classification purposes The designation does therefore not give any symbol for shielding gas The classification is divided into four parts: 1) the first part gives a symbol indicating the product/process to be identified; 2) the second part gives a symbol indicating the strength and the elongation of all-weld metal; 3) the third part gives a symbol indicating the impact properties of all-weld metal; 4) the fourth part gives a symbol indicating the chemical composition of rods or wires Scope This standard specifies requirements for classification of rods, wires and all-weld metal in the as-welded condition for tungsten inert gas welding of non alloy and fine grain steels with a minimum yield strength of up to 500 N/mm2 in the as-welded condition Normative references This European Standard incorporates by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies EN 439 Welding consumables Ð Shielding gases for arc welding and cutting EN 759 Welding consumables Ð Technical delivery conditions for welding filler metals Ð Type of product, dimensions, tolerances and marking EN 1597-1 Welding consumables Ð Test methods Ð Part 1: Test assembly for all-weld metal specimens in steel, nickel and nickel alloys EN ISO 13916 Welding Ð Guidance for the measurement of preheating temperature, interpass temperature and preheat maintenance temperature (ISO 13916 : 1996) ISO 31-0 : 1992 Quantities and units Ð Part 0: General principles BSI 1997 Symbols and requirements 4.1 Symbol for the product/process The symbol for a rod/wire for the tungsten inert gas welding process and/or the resulting weld deposit shall be the letter W 4.2 Symbol for strength and elongation of all-weld metal The symbol in table indicates yield strength, tensile strength and elongation of the all-weld metal in the as-welded condition in accordance with clause Table Symbol for strength and elongation of all-weld metal Symbol Minimum1) yield strength ReL N/mm2 Tensile strength Rm N/mm2 Minimum elongation2) A % 35 355 440 to 570 22 38 380 470 to 600 20 42 420 500 to 640 20 46 460 530 to 680 20 50 500 560 to 720 18 1) For yield strength the lower yield (ReL) shall be used when yielding occurs, otherwise the 0,2 % proof strength (Rpo,2) shall be used 2) Gauge length is equal to five times the test specimen diameter Page EN 1668 : 1997 4.3 Symbol for impact properties of all-weld metal The symbol in table indicates the temperature at which an average impact energy of 47 J is achieved under conditions given in clause Three specimens shall be tested Only one individual value may be lower than 47 J but not lower than 32 J When an all-weld metal has been classified for a certain temperature, it automatically covers any higher temperature in table Table Symbol for impact properties Symbol Temperature for minimum average impact energy of 47 J ÊC Z No requirements A + 20 0 2 20 30 40 50 60 Mechanical tests 5.1 General Tensile and impact tests and any required retests shall be carried out in the as-welded condition using an all-weld metal test assembly type prepared in accordance with EN 1597-1 using 2,4 mm rods/wires and welding conditions as described in 5.2 and 5.3 5.2 Preheating and interpass temperatures Preheating is not required, welding can start from room temperature The interpass temperature shall be measured using temperature indicator crayons, surface thermometers or thermocouples, see EN ISO 13916 The interpass temperature shall not exceed 250 ÊC If, after any pass, this interpass temperature is exceeded, the test assembly shall be cooled in air to a temperature below that limit 5.3 Welding conditions The welding conditions and details of test assembly in table shall be used The direction of welding to complete a layer consisting of two passes shall not vary, but the direction of welding of layers shall be alternated 4.4 Symbol for the chemical composition of rods/wires The symbol in table indicates the chemical composition of the rod/wire and includes an indication of characteristic alloying elements Table Symbol for chemical composition of rods/wires Symbol Chemical composition % (m/m) C Si 1) 2) 3) Mn P S Mo Ni Al Ti + Zr W0 Any agreed analysis not specified in this standard W2Si 0,06 to 0,14 0,50 to 0,80 0,90 to 1,30 0,025 0,025 Ð Ð Ð Ð W3Si1 0,06 to 0,14 0,70 to 1,00 1,30 to 1,60 0,025 0,025 Ð Ð Ð Ð W4Si1 0,06 to 0,14 0,80 to 1,20 1,60 to 1,90 0,025 0,025 Ð Ð Ð Ð W2Ti Ð 0,05 to 0,20 0,05 to 0,25 0,04 to 0,14 0,40 to 0,80 0,90 to 1,40 0,025 0,025 Ð W3Ni1 0,06 to 0,14 0,50 to 0,90 1,00 to 1,60 0,020 0,020 Ð 0,80 to 1,50 Ð Ð W2Ni2 0,06 to 0,14 0,40 to 0,80 0,80 to 1,40 0,020 0,020 Ð 2,10 to 2,70 Ð Ð W2Mo 0,08 to 0,12 0,30 to 0,70 0,90 to 1,30 0,020 0,020 0,40 to 0,60 Ð Ð Ð 1) Finished product chemical composition If not specified: Mo < 0,15 %, Ni < 0,15 %, Cr < 0,15 %, V < 0,03 %, Al < 0,02 %, Ti + Zr < 0,15 %, Cu < 0,35 % (residual in steel plus any coating) 2) Single values shown in the table are maximum values 3) The results shall be rounded to the same number of significant figures as in the specified value using the rule A in accordance with annex B of ISO 31-0 : 1992 BSI 1997 Page EN 1668 : 1997 Designation Table Welding conditions Conditions Parameters Rod/wire diameter mm 2,4 Length of weld deposit mm 200 Type of current1) Welding current A Welding speed mm/min Interpass temperature range ÊC (no preheat) 1) d.c 240 ± 20 140 ± 20 # 250 d.c means direct current Electrode negative Chemical analysis Chemical analysis is performed on specimens of the rod/wire Any analytical technique can be used, but in case of dispute reference shall be made to established published methods NOTE See annex A Technical delivery conditions Technical delivery conditions shall meet the requirements in EN 759 BSI 1997 The designation of the rod or wire shall follow the principles given in the example below: Example: A weld deposit produced by tungsten inert gas welding (W) having a minimum yield strength of 460 N/mm2 (46) and a minimum average impact energy of 47 J at 30 ÊC (3) produced under argon shield, EN 439-I1, using the rod W3Si1 is designated: Rod EN 1668 W 46 W3Si1 A rod complying with the chemical requirement of W3Si1 in table is designated: Rod EN 1668 W3Si1 where: EN 1668 = standard number; W = rod/wire and or deposit/tungsten inert gas welding (see 4.1); 46 = strength and elongation (see table 1); = impact properties (see table 2); W3Si1 = chemical composition of rod/wire (see table 3) Page EN 1668 : 1997 Annex A (informative) Bibliography A.1 Handbuch fuÈr das EisenhuÈttenlaboratorium, VdEh, DuÈsseldorf A.2 BS 6200-3 Sampling of iron, steel and other ferrous metals Ð Part : Methods of analysis A.3 CR 10261 ECISS Information Circular 11 Ð Iron and Steel Ð Review of available methods of chemical analysis BSI 1997 blank BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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